Power lift



J. H. STARR Oct. 6, 1953 POWER LIFT Original Filed Feb. 26, 1945 R .R m T S N mm 0 J Patented Oct. 6, 1953 POWER LIFT John H. Starr,

Mayville, Wis., assignor to John Deere Van Brunt Company, 'a corporation of Wisconsin Continuation of application Serial February 26, 1945. This No. 579,870, application January 2, 1952, Serial No. 264,607

Claims. (01. 97-4631) This is a continuation of my copending application, Serial No. 579,870, filed February 26, 1945, now abandoned.

The present invention relates generally jto agricultural implements and more particularly to power operated mechanism for raising and lowering the tools and other parts associated therewith.

The object and general nature of the present invention is the provision of a new and improved means for attaching the power cylinder of a hydraulic power lift device to the implement so as to make it convenient to readily attach and detach the hydraulic unit from the implement so that the hydraulic unit, which is generally in the form of a jack or ram, may remain in operative connection with the tractor which ordinarily propels the implement. Further, it is a feature of this invention to provide a new and improved quick detachable bracket by which the attachment and detachment of the cylinder device may readily be accomplished but without any danger of the parts becoming disconnected or loosened during operation of the implement) so as to render the power lift thereof defective or unreliable.

These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description, taken in conjunction with the accompanying drawings in which one preferred embodiment of this invention has been illustrated.

In the drawings:

Figure 1 is a side view of portions of the frame of a field cultivator having power lift mechanism for raising or lowering the tools and means constructed according to the principles of the present invention for attaching and detaching the power lift unit.

Figure 2 is an enlarged view, partly in section, showing the manner of holding the power lift cylinder in place.

Figure 3 is a view similar the attaching bracket releasing position.

Figure 4 is a partial enlarged plan view of the attaching bracket construction, the power cylinder being removed.

Figure 5 is a perspective view of the bracket that is normally fixed to the implement.

Referring now more particularly to Figure 1, the frame of the agricultural implement, such as a field cultivator, is indicated by the reference numeral I, and mounted on the frame I parts in their cylinderto Figure 2, showing end of the hook portion by suitable brackets 2 is a pressure shaft 3 to which pressure arms 4 are fixed in the usual way. The tools (not shown) are connected with the rear ends of the pressure arms 4. A raising and lowering arm 6 is fixed in any suitable manner to the pressure shaft 3 and the rear end of a link i is pivoted, as at 8, to the outer end of the arm 6. A U-shaped link part II is welded, as at I2, to the front end of the link I and at its front the U-shaped member II is pivoted at It to a lever M which is swingably mounted, at I 5, on a bracket I 6 carried by a part of the hitch frame Il. The latter includes rearwardly diverging angle members I B and IS, the forwardly converging ends of which are connected together by a plate 2|.

For operating the pressure shaft 3 by power derived from the tractor to which the field cultivator is connected, I provide a double acting hydraulic unit which includes a cylinder 25 and a piston rod 27. The latter is connected by a pin 23' to the upper end of the arm or lever I4 and the front end of the cylinder is provided with a pair of apertured ears 28 and 29, see Figure 2, which receive a pin 30 extending therebetween and normally permanently mounted in place. A pair of hose lines 33 and 3d lead from the ram unit 25 to a hydraulic power unit (not shown) mounted on the tractor and equipped with suitable valve mechanism whereby the piston rod 2'! may be extended or retracted to swing the lever I4 and thus rock the pressure shaft 3 to raise and lower the tools. The rear end of the piston rod 21 may be readily removed from the upper end of the lever I4, which is bifurcated, by taking out a quick detachable spring connector 36 when removing the pin 28'. The means for making the front end of the cylinder 25 quickly detachable will now be described.

A bracket 4i], preferably in the form of a casting, is bolted, as at 4!, to the forward end portions of the angles l8 and I9 and is provided at its upper portion with a cylinder-receiving section which includes a rearwardly facing hook portion 44. The upper portion d3 of the bracket 40 is widened, as at 45, to provide sufficient stock to form a through opening 41 in the bracket 46 extending generally from front to rear.

Slidably mounted in the opening il is a shiftable member 5I having a hook portion 52 arranged in upstanding relation and long enough to substantially come into contact with the rear 44 when the pin 36 of the cylinder is held in place in a socket portion 53 formed in the bracket III], as best shown in the cylinder in position relative to said bracket, said upwardly extending, pin-receiving portion of said bracket having a width substantially equal to the width of the pin-engaging portion of said slidable member and the distance between said spaced ears, so as to pass between and substantially contact the inner faces of said laterally spaced ears and thereby limit lateral movement of the cylinder relative to said bracket, and means acting between said member and said bracket for holding the member in a position connecting said cylinder to said bracket.

JOHN H. STARR.

. 6 References Cited in the tile of this patent UNITED STATES PATENTS Number 5 36,780 805,949 1,559,653 2,292,961 2,320,168 m 2,361,362

Number Name Date Dalpe Apr. 2, 1895 Facette Nov. 28, 1905 Stucker et al. Nov. 3, 1925 Mott Aug. 11, 1942 Benjamin et a1. May 25, 1943 Altgelt Oct. 31, 1944 FOREIGN PATENTS Country Date Germany July 15, 1937 

